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snapshotscheduler.go
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snapshotscheduler.go
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package snapshotscheduler
import (
"context"
"os"
"strings"
"time"
"github.com/pkg/errors"
downstreamtypes "github.com/replicatedhq/kots/pkg/api/downstream/types"
apptypes "github.com/replicatedhq/kots/pkg/app/types"
snapshot "github.com/replicatedhq/kots/pkg/kotsadmsnapshot"
snapshottypes "github.com/replicatedhq/kots/pkg/kotsadmsnapshot/types"
"github.com/replicatedhq/kots/pkg/logger"
"github.com/replicatedhq/kots/pkg/store"
"k8s.io/apimachinery/pkg/util/rand"
cron "github.com/robfig/cron/v3"
)
func Start() error {
logger.Debug("starting snapshot scheduler")
startLoop(appScheduleLoop, 60)
startLoop(instanceScheduleLoop, 60)
return nil
}
func startLoop(fn func(), intervalInSeconds time.Duration) {
go func() {
for {
fn()
time.Sleep(time.Second * intervalInSeconds)
}
}()
}
func appScheduleLoop() {
appsList, err := store.GetStore().ListInstalledApps()
if err != nil {
logger.Error(errors.Wrap(err, "failed to list installed apps for scheduled snapshots"))
return
}
for _, a := range appsList {
if a.RestoreInProgressName != "" {
continue
}
if err := handleApp(a); err != nil {
logger.Error(errors.Wrapf(err, "failed to handle scheduled snapshots for app %s", a.ID))
}
}
}
func instanceScheduleLoop() {
clusters, err := store.GetStore().ListClusters()
if err != nil {
logger.Error(errors.Wrap(err, "failed to list clusters for scheduled instance snapshots"))
return
}
for _, c := range clusters {
if err := handleCluster(c); err != nil {
logger.Error(errors.Wrapf(err, "failed to handle scheduled instance snapshots for cluster %s", c.ClusterID))
}
}
}
/* App Level Scheduled Snapshots */
func handleApp(a *apptypes.App) error {
if a.SnapshotSchedule == "" {
return nil
}
/*
* This queue uses the scheduled_snapshots table to keep track of the next scheduled snapshot
* for each app. Nothing else uses this table.
*
* For each app, list all pending snapshots. If scheduled snapshots are enabled there should be
* exactly 1 pending snapshot for the app. (If the table has been manually edited and there are
* 0 or 2+ pending snapshots this routine will fix it up so there's exactly 1 when it finishes.)
*
* Before taking a snapshot, first check that it's not scheduled for a time in the future, then
* check that there is not already another snapshot in progress for the app. If both of those
* checks pass, then create the Backup CR for velero, save the Backup name to the row to
* mark that it has been handled, then schedule the next snapshot from the app's cron schedule
* expression.
*/
pending, err := store.GetStore().ListPendingScheduledSnapshots(a.ID)
if err != nil {
return errors.Wrap(err, "failed to list pending scheduled snapshots")
}
if len(pending) == 0 {
logger.Infof("No pending snapshots scheduled for app %s with schedule %s. Queueing one.", a.ID, a.SnapshotSchedule)
queued, err := nextScheduledApplicationSnapshot(a.ID, a.SnapshotSchedule)
if err != nil {
return errors.Wrap(err, "failed to get next schedule")
}
if err := store.GetStore().CreateScheduledSnapshot(queued.ID, queued.AppID, queued.ScheduledTimestamp); err != nil {
return errors.Wrap(err, "failed to create scheduled snapshot")
}
return nil
}
next := pending[0]
if next.ScheduledTimestamp.After(time.Now()) {
logger.Debugf("Not yet time to snapshot app %s", a.ID)
return nil
}
hasUnfinished, err := snapshot.HasUnfinishedApplicationBackup(context.Background(), os.Getenv("POD_NAMESPACE"), a.ID)
if err != nil {
return errors.Wrap(err, "failed to to check if app has unfinished backups")
}
if hasUnfinished {
logger.Infof("Postponing scheduled application snapshot for app %s because one is in progress", a.ID)
return nil
}
backup, err := snapshot.CreateApplicationBackup(context.Background(), a, true)
if err != nil {
return errors.Wrap(err, "failed to create backup")
}
if err := store.GetStore().UpdateScheduledSnapshot(next.ID, backup.ObjectMeta.Name); err != nil {
return errors.Wrap(err, "failed to update scheduled snapshot")
}
logger.Infof("Created application backup %s from scheduled snapshot %s", backup.ObjectMeta.Name, next.ID)
if len(pending) > 1 {
err := store.GetStore().DeletePendingScheduledSnapshots(a.ID)
if err != nil {
return errors.Wrap(err, "failed to delete pending scheduled snapshots")
}
}
queued, err := nextScheduledApplicationSnapshot(a.ID, a.SnapshotSchedule)
if err != nil {
return errors.Wrap(err, "failed to get next schedule")
}
if err := store.GetStore().CreateScheduledSnapshot(queued.ID, queued.AppID, queued.ScheduledTimestamp); err != nil {
return errors.Wrap(err, "failed to create scheduled snapshot")
}
logger.Infof("Scheduled next application snapshot %s", queued.ID)
return nil
}
/* Cluster/Instance Level Scheduled Snapshots */
func handleCluster(c *downstreamtypes.Downstream) error {
if c.SnapshotSchedule == "" {
return nil
}
/*
* This queue uses the scheduled_instance_snapshots table to keep track of the next scheduled instance snapshot
* for each cluster. Nothing else uses this table.
*
* For each cluster, list all pending snapshots. If scheduled instance snapshots are enabled there should be
* exactly 1 pending snapshot for the cluster. (If the table has been manually edited and there are
* 0 or 2+ pending snapshots this routine will fix it up so there's exactly 1 when it finishes.)
*
* Before taking a snapshot, first check that it's not scheduled for a time in the future, then
* check that there is not already another snapshot in progress for the cluster. If both of those
* checks pass, then create the Backup CR for velero, save the Backup name to the row to
* mark that it has been handled, then schedule the next snapshot from the cluster's cron schedule
* expression.
*/
pending, err := store.GetStore().ListPendingScheduledInstanceSnapshots(c.ClusterID)
if err != nil {
return errors.Wrap(err, "failed to list pending scheduled instance snapshots")
}
if len(pending) == 0 {
logger.Infof("No pending instance snapshots scheduled for cluster %s with schedule %s. Queueing one.", c.ClusterID, c.SnapshotSchedule)
queued, err := nextScheduledInstanceSnapshot(c.ClusterID, c.SnapshotSchedule)
if err != nil {
return errors.Wrap(err, "failed to get next schedule")
}
if err := store.GetStore().CreateScheduledInstanceSnapshot(queued.ID, queued.ClusterID, queued.ScheduledTimestamp); err != nil {
return errors.Wrap(err, "failed to create scheduled instance snapshot")
}
return nil
}
next := pending[0]
if next.ScheduledTimestamp.After(time.Now()) {
logger.Debugf("Not yet time to snapshot instance/cluster %s", c.ClusterID)
return nil
}
hasUnfinished, err := snapshot.HasUnfinishedInstanceBackup(context.Background(), os.Getenv("POD_NAMESPACE"))
if err != nil {
return errors.Wrap(err, "failed to to check if cluster has unfinished backups")
}
if hasUnfinished {
logger.Infof("Postponing scheduled instance snapshot for cluster %s because one is in progress", c.ClusterID)
return nil
}
backup, err := snapshot.CreateInstanceBackup(context.Background(), c, true)
if err != nil {
return errors.Wrap(err, "failed to create instance backup")
}
if err := store.GetStore().UpdateScheduledInstanceSnapshot(next.ID, backup.ObjectMeta.Name); err != nil {
return errors.Wrap(err, "failed to update scheduled instance snapshot")
}
logger.Infof("Created instance backup %s from scheduled instance snapshot %s", backup.ObjectMeta.Name, next.ID)
if len(pending) > 1 {
err := store.GetStore().DeletePendingScheduledInstanceSnapshots(c.ClusterID)
if err != nil {
return errors.Wrap(err, "failed to delete pending scheduled instance snapshots")
}
}
queued, err := nextScheduledInstanceSnapshot(c.ClusterID, c.SnapshotSchedule)
if err != nil {
return errors.Wrap(err, "failed to get next schedule")
}
if err := store.GetStore().CreateScheduledInstanceSnapshot(queued.ID, queued.ClusterID, queued.ScheduledTimestamp); err != nil {
return errors.Wrap(err, "failed to create scheduled instance snapshot")
}
logger.Infof("Scheduled next instance snapshot %s", queued.ID)
return nil
}
func nextScheduledApplicationSnapshot(appID string, cronExpression string) (*snapshottypes.ScheduledSnapshot, error) {
cronSchedule, err := cron.ParseStandard(cronExpression)
if err != nil {
return nil, errors.Wrap(err, "failed to parse cron expression")
}
scheduledSnapshot := &snapshottypes.ScheduledSnapshot{
AppID: appID,
ID: strings.ToLower(rand.String(32)),
ScheduledTimestamp: cronSchedule.Next(time.Now()),
}
return scheduledSnapshot, nil
}
func nextScheduledInstanceSnapshot(clusterID string, cronExpression string) (*snapshottypes.ScheduledInstanceSnapshot, error) {
cronSchedule, err := cron.ParseStandard(cronExpression)
if err != nil {
return nil, errors.Wrap(err, "failed to parse cron expression")
}
scheduledSnapshot := &snapshottypes.ScheduledInstanceSnapshot{
ClusterID: clusterID,
ID: strings.ToLower(rand.String(32)),
ScheduledTimestamp: cronSchedule.Next(time.Now()),
}
return scheduledSnapshot, nil
}